I am unfamilar with this acronym.
LAMBDA is a non-profit, gay / lesbian / bisexual / transgender agency dedicated to reducing homophobia, inequality, hate crimes, and discrimination by encouraging self-acceptance, cooperation, and non-violence.
He meant NAMBLA (Man Boy "Love" Association - I can't even write that without feeling nausea), I believe. LAMBDA is a pro-homosexual legal organization, dedicated to shoving the "gay" agenda down our collective throats harder and faster.